Heres a couple of posts you should read.
https://en.wikipedia.org/wiki/Random_walk_hypothesis
http://www.investopedia.com/terms/e/efficientmarkethypothesis.asp
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Heres a couple of posts you should read.
https://en.wikipedia.org/wiki/Random_walk_hypothesis
http://www.investopedia.com/terms/e/efficientmarkethypothesis.asp